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Table 3 Subjective perception of sleep disruption (n = 14)

From: Effects of earplugs and eye masks on nocturnal sleep, melatonin and cortisol in a simulated intensive care unit environment

  No disruption A little disruption but able to fall asleep Sometimes unable to fall sleep Light sleep, easy be awakened Significant disruption, awake all night
Noise 0 11 2 1 0
Light 0 8 1 5 0